Lighting-fixture.



UNITED TAF ATENT OFFICE.

OTTO H. MOI-IR, OF KENTFIELD, CALIFORNIA, ASSIGNOR TO MOI-IRLITE COMPANY, A CORPORATION OF CALIFORNIA.

LIGHTING-FIXTURE.

Specification of Letters Patent.

Application filed October 5, 1912.

Patented Oct. 1 1, 1913.

Serial No. 724,096.

To all whom, it may concern Be it known that I, Or'ro H. Moi-IR, a citizen of the United States, and a resident of Kentfield, Marin county, State of California, have invented certain new and useful Improvements in Lighting-Fixtures, of which the following is a specification.

The invention relates to lighting fixtures adapted to be used particularly in connection with incandescent electric lamps.

The object of the invention is to provide a lighting fixture from which the light is diffused evenly from the whole surface.

Another object of the invention is to provide a lighting fixture which conceals the lamp from the eye and emanates diffused light only toward the eye of the observer.

Another object of the invention is to provide a lighting fixture which emanates diffused light evenly in all directions, so that regardless of the position from which the fixture is viewed, an evenly distributed glow is obtained.

The invention possesses other advantageous features, which, with the foregoing, will be set forth at length in the following description where I shall outline in full that form of the invention which I have selected for illustration in the drawings accompanying and forming part of the present description. The novelty of the invention will be included in the claims succeeding said description. From this, it will be apparent that I do not limit myself to the showing made by such drawings and description, as I may adopt many variations within the scope of my invention.

Referring to said drawings: Figure 1 is a front view of the fixture of my invention, part thereof being broken away to disclose the lamps. Fig. 2 is a longitudinal section of the fixture taken on the line 22 Fig. 1. Fig. 3 is a transverse section of the fixture taken on the line 3-3 Fig. 1. Fig. 4: is a horizontal section of a portion of a circular fixture adapted to be used as a centerpiece, embodying the features of my invention, the section being taken on the line 44 Fig. 5. Fig. 5 is a vertical section of the fixture shown in Fig. 4, the section being taken on the line 55 Fig. 4.

The fixture consists of a body having a shell-like form, comprising the back wall 6 and the standing sides 7. That portion of the body lying between the sides is depressed so that the lamps 8 lie below the front edge 9 of the sides. The open face of the shell is partly constricted by the ledge 12, which is joined to the rear side 13, and beneath which the lamps are arranged. The fixture is placed so that when it is viewed, the ledge 12 conceals the lamps, and only the diffused light rays are visible.

The fixture is preferably formed entirely of plaster of paris or of a metal backing covered with plaster of paris. This material lends itself very satisfactorily to this purpose, and does not become materially heated when the lamps are illuminated. The interior surface of the shell is coated or painted with a compound or material possessing high diffusive properties so that substantially all of the light produced by the lamps is available for illumination. The fixture is designed to be used in connection with two or more lamps 8. The interior surface of the back wall 6 is provided with a transverse or radial rib or elevation 14L arranged midway between the successive lamps, the height of the rib being such that the rays from one lamp do not fall upon the other lamp. The rib extends substantially across the whole inner surface of the shell, terminating at one end below or on the under side of the ledge and at the other end gradually merging into the back wall, where it meets the standing side. The height of the rib and the inclination of its sides are also so proportioned that the entire surface of the back wall is equally illuminated at all points, so that no dark spots or shadows are formed on the surface. For this purpose, also, the under side of the ledge 12 and the inner face of the rear side 13 are formed on a smooth curve, approaching concentricity with the lamp. The inner surface of the back wall is also formed on a smooth curve with the rear side and the front side, the back wall being inclined toward the front edge 9. The back wall and the sides are also joined on smooth curves. The ridge of the rib 14; follows generally the curvature of the inner surface of the shell with the exception that the rib is highest adjacent the lamp and is gradually depressed so that it merges into the bottom or back wall at the opposite side of the back wall from which the lamp occurs. The curvature and contour of the diffusing surface is such that the illumination is equally distributed over the entire surface, and is diffused evenly therefrom, producing an even glow which is highly efiicient in illumination.

InFigs. 1, 2 and 3, I have shown a recl tangular fixture adapted to contain two lamps placed with their socket ends adja cent, the lamps being arranged longitinilinally of the fixture, and the rib extending transversely thereof, to produce an even; illumination over the entire surface. In the fixture shown in Figs. 4: and 5, which is adapted to be used as a centerpiece, the fixture is circular in form and the ribs are 3 arranged radially between the successive l lamps.

In the circular fixture, the ledge 12 assumes the shape of a bowl, and the outer or peripheral edge thereof is curved upward to conceal the lamp, so that indirect lightl ing only is obtained. The fixture shown in 1 Figs. 1, 2 and 3 is preferably arranged in side walls with the side 13 forming tin. lower side of the fixture, so that the le lge 1 entirely conceals the lamp from view. I. order to obtain this same effectin a center fixture, the ledge 12 is curved upward at it outer edge.

I claim:

1. A lighting fixture comprising a shell having a curved inner surface, ribs dividing said shell into cavities and conforming in shape to the curvature of the inner surface of the shell, a lamp arranged in each cavity and a ledge arranged adjacent said lamps extending in front of and concealing said lamps.

2. A lighting fixture comprising a shell having a rounded interior surface terminating in an outwardly extending top wall, an outwardly and upwardly extending ledge of less length than the top wall arranged below and spaced apart from said wall, lamps arranged behind said ledge and ribs on the inner surface of said shell conforming to the curvature thereof.

3. A lighting fixture comprising a shell of opaque material, a ledge arranged longitudinally along one side of the shell. lamps arranged in the shell below said ledge. and a rib extending transversely of the shell intermediate between the lamps, the height of said rib decreasing as it departs from said lamps.

41. A lighting fixture comprising a shell of opaque material, lamps arranged within the shell adjacent one side, a ledge overlying said lamps, the inner faces of said. ledge and said side being substantially concentric with said lamps, the base of the shell being inclined upwardly from the base of said side and terminating in a smooth curve at the opposite side, and a central rib of less height than the depth of the shell arranged intermediate between the lamps and at right angles to said side, the height of the rib gradually decreasing as it departs from said side.

A lighting fixture comprising a structure having an outwardly and downwardly ex ending top wall, an outwardly and upwardly curved bottom wall, joining the top wall. in a smc th carve, ribs extending from. said bottom wall and terminating in said top wall, andlamps arranged between said ribs behind said bottom wall.

6. A lighting fixture comprising a struc 1 ture having a circular top wall, a circular ledge of less diam ter than said top wall arranged below said top wall, radially ex tending ribs on said top wall and lamps arranged behind said ledge.

7. A lighting fixture comprising a circular structure having a top wall curved downward in a smooth curve at its inner port-ion,

; a circular ledge having a curved upper face meeting said downwardly curved top wall in a smooth curve, a plurality of radially 5 extending curved ribs corresponding substantially to the curvature of the structure dividing the space between the periphery of the ledge and the periphery of the top wall into cavities, and lamps arranged in said cavities above said ledge and within the periphery thereof.

8. A lighting fixture comprising a structure having a circular top wall, an inverted conical structure depending from the center of said top wall, radially extending ribs on said conical structure and top wall, an upwardly curved circular bottom wall of less diameter than said top wall arranged below said conical structure, and means within the circumference of said bottom wall for illuminating the surface of said conical structure and top wall.

9. A lighting fixture comprising a structure having a circular top wall sloping downwardly toward the periphery thereof, an inverted conical structure depending from said top wall and joining the same in a smooth curve, means for illuminating the surface of said wall and structure, and an upwardly curved bottom wall extending in front of said illuminating means.

10. A lighting fixture comprising a structure having a top wall, an inverted conical structure depending centrally therefrom, a plurality of radially extending ribs decreas ing in height outwardly and arranged on said conical structure and top wall, means for illuminating the surface of said structure and walls, and a ledge extending upwardly in front of said illuminating means.

11. A lighting fixture comprising an integral structure having an outwardly and downwardly extending circular top wall, an inverted conical structi'lre depending from said wall, an upwardly and outwardly curved bottom wall of less diameter than said top wall terminating in a plane below the periphery of said top Wall, said top Wall, conical structure and bottom Wall meeting in a smooth curve, a plurality of radially extending ribs conforming to said smooth curve springing from the outer edge of said bottom Wall and terminating at the outer edge of the top Wall, and a plurality of lamps arranged in the cavities formed by the successive ribs on the bottom Wall.

12. In a lighting fixture, an inverted conical structure, a plurality of radially extending ribs arranged on said conical structure, means for illuminating the surface of said structure and a ledge extending upwardly in front of said illuminating means.

In testimony whereof, I have hereunto set my hand at San Francisco, California, this 3rd day of July 1912.

OTTO H. MOHR.

In presence of- H. G. PRosT, A. C. HAMPTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

